.header-wrapper {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
}

.nav-wrapper {
  position: fixed;
  left: 0;
  right: 0;
  top: 44px;
}

.mask {
  position: fixed;
  z-index: 1000;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
}

.left {
  display: inline-block;
  width: 45%;
}

.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}